Ordered for $27.33 out the door from Amazon 12/21, received 1/6. The OEM ear tips didn't get me a good seal, so I switched to SpinFit CP145. They have a bit wider aperture, and I found I needed to EQ up the bass on my Qudelix 5K about +4 dB (PEAK, 15 Hz, Q = .2), in addition to the prescribed...